What is the difference between system integration testing and acceptance testing?

What is the difference between system integration testing and acceptance testing?
A . System integration testing is testing non-functional requirements Acceptance testing concentrates on the functionality of the system
B . System integration testing is executed by the developers. Acceptance testing is done by the customer
C . System integration testing verifies that a system interfaces correctly with other systems. Acceptance testing verifies compliance to requirements
D . System integration testing verifies compliance to requirements Acceptance testing
verifies correct interaction with other systems existing in the user’s environment

Answer: B